NMR measurements show an unusually strong RKKY coupling between niobium nuclei in Nb3Sn, making nuclear spin coherence about 20 times longer than dipolar coupling alone would allow.
Zhou,The effects of variable tin content on the proper- ties of A15 superconducting niobium-3-tin(The Florida State University, 2011)
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Nuclear spin coherence in superconducting Nb$_3$Sn
NMR measurements show an unusually strong RKKY coupling between niobium nuclei in Nb3Sn, making nuclear spin coherence about 20 times longer than dipolar coupling alone would allow.